Systems Administrator Project Management

Charles Rohrbacher

210-***-**** · Schertz, TX · ***************@*****.***

https://www.linkedin.com/in/charles-rohrbacher-0b67a685/

Systems Administrator

Summary

With over 19 years of IT experience, I specialize in IT infrastructure, systems administration, and virtualization, delivering innovative solutions across government and defense sectors. I have a proven track record in optimizing virtual environments, managing multi-node server farms, and executing global server consolidation programs for the Air Force. Past roles at Lockheed-Martin/Leidos included administering 460+ Windows servers and web applications for 300,000+ personnel, ensuring system performance and mission alignment. Key strengths include project management, security compliance, and expertise in virtualization and ITSM processes.

Experience

Systems Administrator II

Agile Defense, LLC Remote 01/2025 – 04/2025

●Title change due to company reorganization.

Solutions Engineer

Agile Defense, LLC Remote 05/2022 – 01/2025

●Assist the IT team with helpdesk duties and assist various users with IT-related issues.

●Assist in managing the company's Azure-based Active Directory and O365 environment to include but not limited to:

oCreate/delete/reset accounts in Entra ID (both user and device accounts)

oManage devices in Intune. Create policies and applications for deployment.

oManage policies for security-related functions (Conditional Access, Compliance, etc)

oMange external applications and configure SSO requirements for external SaaS applications.

●Administer the servers and AD environment for the Army RLAS(Regional Level Application Software) development project in Azure.

●Assist in developing Cybersecurity policies and procedures.

oEvaluate and remediate vulnerabilities using Tenable.io and Defender XDR.

oRemediation to comply with CMMC and ISO audits.

●Assist in coming up with solutions to the company’s IT-related issues to include policies and procedures.

●Assist in managing Agile Defense’s VMware-based lab environment using Vmware Horizon and ESX/vSphere.

VMware Administrator III

Agile Defense, LLC Ft. Sam Houston, TX 11/2021 – 05/2022

Contractor, HQ US Army North (ARNORTH) G6

●Ensure peak operating efficiency and restoral of organizations VMWARE infrastructure.

●Makes control adjustments to memory and storage/usage.

●Create and deploys STIG compliant VM templates for all Army Gold Master Microsoft products

(Server 2003/2008R2). Prepare STIG documentation for Information System Security Manager (ISSM) review.

●Install, operates and configures ESX or ESXi vCenter Server

●Install, operates and configures vCenter Server components

●Deploy, manage, and migrate virtual machines

●Manage user access to the VMware infrastructure

●Monitor resource usage and adjust and scale to meet changes in usage.

●Maintain security and ensure high availability of data.

●Perform patch management as directed by USARNORTH G6 ISSM Staff.

●Monitor systems usage and set automated alert to trigger proactive response to minimize system downtime and keeps management informed on potential system deficiencies.

●Works with USARNORTH provided service and maintenance support for any problems that is beyond the capability of the appointed Senior System Engineer.

●Maintains equipment and applications in accordance with equipment/application vendor standards.

Virtualization Engineer III

Agile Defense, LLC Remote 04/2021 – 09/2021

Contractor, DARPA (Defense Advanced Research Projects Agency)

Perform system administration and management duties for all virtual infrastructure systems and supporting physical infrastructure in primary and DR sites.

Install, configure and manage server infrastructure to include Pivot 3 Hyperconverged solution

Monitor, administer and maintain vCenter modules and configurations

Implement patches and upgrades to ensure VM environment in compliance with CIS recommendations

Maintain responsibility for virtualization storage management of data stores and pools

Analyze and execute VMware performance tuning strategies

Support daily monitoring and optimization of VM servers and hosts

Review completion and implementation of system additions and/or enhancements and make recommendations to

management and/or clients

Develop documentation on new or existing systems

Identify, analyze, and resolve system problems

Optimize, automate and troubleshoot a Virtual Environment using PowerCLI

Participate in rotational System Administration On Call support roster

Understand the snapshots and clones and making sure that Tape backups using TSM is running as required

Work with Engineering and Architecture teams on new products/strategies and recommend solutions

Maintain basic understanding of Storage systems and connectivity

Infrastructure Administrator (VMware Engineer)

Agile Defense, LLC Lackland AFB, Texas 03/2017 – 11/2021

Contractor, AFLCMC/HNIB (“IPN Pathfinder”)

●Engineer and maintain a multi-node/multi-site virtual server farm utilizing VMware ESXi 6.7 (vSphere) at the following locations:

Lackland AFB, TX

Hanscom AFB, MA

Buckley AFB, CO

Cheyenne Mountain Complex, CO

F.E. Warren AFB, WY

●Design, install, and maintain a server environment utilizing Cisco UCS servers and chassis.

●Design, install, and maintain a storage environment utilizing EMC Unity 500 storage systems.

Involved in every aspect of the IPN Pathfinder Program to consolidate server farms and data centers into a single facility at every Air Force base across the globe.

Work with various Air Force agencies to ensure the successful deployment of equipment and software, and to aid in the maintenance and repair of IPN systems.

Systems Administrator (Windows)

Lockheed-Martin/Leidos Corporation Randolph AFB, Texas 05/2007 – 03/2017

Contractor, AFPOA/DFOW

●Install, administer, monitor and maintain 460+ Windows and web servers hosted by AFPOA

●Apply security, IIS and OS patches to all Windows-based servers in accordance with DISA STIG requirements

●Support personnel data systems Computer-Communications Requirements Documents, as needed

●Work closely with management officials to ensure seamless implementation of systems

●Identify and anticipate server performance, availability, capacity or configuration problems

●Resolve installment problems

●Identify and mitigate security vulnerabilities and risks

●Maintain server integrity and availability at all times

●Modify existing systems and relate all aspects of the work to overall system requirements

●Advise on and implement new technology

●Offer alternative approaches in operating systems development and/or problem resolution

●Stay well informed of new, up to the minute technology approaches, evaluating the possible impact on organization missions and development of strategies to satisfy requirements

●Develop formal and informal training session materials/user instructions or manuals

●Present training to enable customer understanding and operation

●Design, install, and maintain a multi-node virtual server farm utilizing VMware ESXi 6.0 (vSphere)

oDesigned and installed a 14-node ESX farm hosting 150+ production VMs, and a 14-node ESX farm hosting 200+ TDE (Test/Dev Environment) VMs utilizing HP C-Class blades.

●Design, install, and maintain a multi-node virtual desktop farm utilizing VMware ESXi 6.0 (vSphere) and VMware Horizon 6.

oDesigned & installed a VDI farm to support up to 4,000 users utilizing HP BL C-class blades consisting of 32 ESXi hosts and various supporting servers.

oHP LeftHand P4800 & P4500 is used for storage interconnected with 10Gbe interfaces for optimal bandwith.

oManage and maintain 24 master images and pools with approximately 300 active desktops using both server 2008R2(DSCC) & Windows7(SDC) images.

●Participate in annual ITDR (Disaster Recovery) exercises, which includes travel to alternate DR site in Alpharetta, GA.

●Coordinate in the installation & configuration of ESX servers.

●Restore backups of Windows & Linux based virtual machines utilizing both VDP (VMware Data Protection), and OVA format.

●Build new servers when backups aren’t available.

●Stand up and configure a separate domain infrastructure, including DNS and users/groups for the ITDR (Disaster Recovery) environment.

●Aid in any troubleshooting required for a successful test of the DR environment.

Desktop Support Technician

Lockheed-Martin Corporation Randolph AFB, Texas 07/2004 – 05/2007

Contractor, AFPC/DPDOSC Core Communications Technician

●Provide technical, operational, and training support for users of Air Force owned computers, either by telephone or on-site, relative to desktop hardware and software packages.

●Perform hardware diagnostics and coordinate repairs.

●Assist in planning and designing PC support systems.

●Act as liaison for data transfer systems design and implementation.

●Install and test personal computers, printers, and other peripherals; configure operating systems, shrink-wrap programs, and applications software programs.

●Develop reports and databases.

●Develop, test, and create operating system images for deployment to the Air Force Personnel Center (AFPC), including the USAF Standard Desktop Configuration (SDC).

●Continuing education in various Air Force and military procedures involving IT equipment and infrastructure.

●Perform system administrator duties of Air Force computers in a Windows Active Directory Domain structure.

Education

Judson High School – Graduated 1991

Air Force Junior ROTC – 4 years

Squadron Administrations Officer – 1 year

Cadet Captain

Skills

Active Directory

Windows Server 2008/2012/2019

Vulnerability remediation and system hardening, to include DISA STIG and CMMC configurations.

Azure Entra/Intune

Virtualization (VMware)

HP & Cisco UCS Blade Servers

Virtual Desktops (VDI)

DoD policies and procedures

Microsoft M365

Current Secret Clearance

Certifications

CompTIA A+

CompTIA Security+

VMware VCP-DCV

ISC2-CC

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